Re: Problem defining global vars

[Geraint Paul Bevan]

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Christian Renz wrote:
| I'm quite new to octave, so forgive me if this is an overly simple
| question. But I wasn't able to find the answer in the wiki or in the
| manual.
|
| When I run the following script, octave complains that a and b are
| undefined. Once I move the definitions inside the function f, everything
| works fine, however. Is there a way I can define a and b so they are
| recognized by f (when used via lsode)?
|


You need to declare a and b as global inside the function body as well
as defining them outside it:

function xdot = f(x, t)
        global a;
        global b;
        xdot = a*x + b;
endfunction

You can find a description of how global variables work if you type
'help -i global' at the Octave prompt.

- --
Geraint Bevan
http://homepage.ntlworld.com/geraint.bevan

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